How can you print something each time an item is emitted?
How can you compute a value from all the items of an observable?
How can you subscribe to the latest observable emitted by a higher-order observable?
How can you combine the values of several observables, item-wise?
How can you retrieve the first item of an observable?
How can you classify the items of an observable, based on some criteria?
How can you drop some elements of an observable, based on some criteria?
How can you chain several observables, one after the other?
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